New formula: makems

This forms part of the LOFAR / MeqTrees software suite and allows the
creation of a MeasurementSet that simulates the tracking of a specified
source by a given antenna array.
makems: Added test

This uses the example configuration files to create an MS in a temp
directory as a test. In addition, run the casacore ms2uvfits converter
as a verification of the produced MS file structure.
obit: Moved test to end of class